Take a look at our TRC Section, especially the Customs Lobby. Here you can find all the BIOC and TCOJ guys guys over there for exaple.
Or you could join the Testers Guild, if you don't mind testing maps and giving feedback, but that's the way I got to know a lot of people here.

Another great way to find awesome players, are ForgeHubs TGIF Nights, look out for the announcement for TGIF 34 within the next couple of days.